Cutting metal roofing panels cleanly and safely is a skill that separates professional installations from sloppy ones. If you have ever wondered how do professionals cut metal roofing, the answer involves specialized tools, careful technique, and an understanding of how different cutting methods affect the metal’s longevity. This guide covers the methods, tools, and best practices used by experienced metal roofing contractors in Oklahoma City.
Why the Cutting Method Matters
Metal roofing panels are coated with paint systems and protective finishes designed to prevent corrosion for decades. The wrong cutting method can destroy that protection at the cut edge, leading to premature rust, voided warranties, and an unsightly roof.
Heat is the primary enemy. Any cutting tool that generates excessive heat at the cut line damages the protective coating and the galvanized or Galvalume layer underneath. That is why professionals are extremely selective about which tools they use and which they avoid.
The wrong tool can also create metal shavings that land on the panel surface and embed in the finish. These tiny steel particles rust quickly and leave orange spots across the entire roof. Preventing this contamination is a priority on every professional metal roofing job.
Electric Metal Shears: The Go To Tool
Electric shears are the preferred cutting tool for most professional metal roofing work. They make clean, straight cuts through steel and aluminum panels without generating significant heat. The cutting action is mechanical rather than abrasive, which preserves the coating on both sides of the cut.
There are two main types. Single cut shears work like powered scissors and produce one clean cut line. Double cut shears, also called nibblers, remove a thin strip of material between two cuts. Both types handle straight lines and gradual curves effectively.
For most Oklahoma City metal roofing projects, electric shears are the primary tool for cutting panels to length, trimming at eaves and rakes, and making cuts around penetrations like plumbing vents and exhaust fans. They are fast, accurate, and produce a clean edge that needs no additional finishing.
Aviation Snips for Detail Work
Aviation snips, also called tin snips, are essential hand tools that every metal roofing professional carries. They come in three varieties: left cutting (red handles), right cutting (green handles), and straight cutting (yellow handles).
Snips are used for short cuts, tight curves, notches around flashing, and detail work where powered shears are too bulky. Cutting around a chimney cricket, for example, requires the precision that only hand snips can provide.
While snips do not generate heat, they can distort the metal if used carelessly. Professionals use smooth, full strokes and support the panel on both sides of the cut to prevent bending or crimping the edges.
Circular Saw with a Metal Cutting Blade
A circular saw fitted with a ferrous metal cutting blade (sometimes called a cold cut blade) is used by some professionals for long, straight cuts through multiple panel layers or heavy gauge material. These blades have carbide teeth that cut through steel cleanly without the extreme heat generated by abrasive discs.
The key distinction is the blade type. A carbide tipped metal cutting blade generates far less heat than an abrasive cutoff wheel. The cut edge stays cooler, preserving more of the protective coating. However, this method still produces metal chips, so professionals cover adjacent panel surfaces with protective material and blow off all debris immediately after cutting.
This technique is most common when cutting standing seam panels or thicker gauge steel that shears cannot handle efficiently.
What Professionals Never Use
Abrasive cutoff wheels, angle grinders with abrasive discs, and standard wood cutting circular saw blades are tools that experienced metal roofing contractors avoid on metal panels. These tools generate extreme heat that burns through the paint, primer, and metallic coating in seconds. The resulting bare edge begins rusting almost immediately.
Abrasive tools also throw a shower of hot metal sparks and particles across the roof surface. These particles embed in the panel finish and create rust spots that spread over time. Cleaning them off after the fact is difficult and often requires chemical treatment.
Some panel manufacturers explicitly state in their warranty documentation that using abrasive cutting tools voids the finish warranty. This is another reason professionals invest in proper shears and cold cut blades rather than relying on cheaper abrasive methods.
Cutting Techniques for Oklahoma City Conditions
Oklahoma City’s weather conditions influence how professionals approach metal roofing cuts. In summer, panels sitting in direct sun can reach surface temperatures exceeding 150 degrees. Cutting hot metal is more dangerous and can cause panels to expand slightly, affecting fit. Experienced crews cut panels in the shade or during cooler parts of the day.
Wind is another factor. Metal panels act like sails once they are cut to size, and Oklahoma City is one of the windiest metro areas in the country. Professionals secure panels firmly before cutting and never leave cut pieces unsecured on the roof surface.
Hail damage repairs often require partial panel replacement, which means making precise cuts on installed panels. Shears and snips are the only safe tools for on roof cutting because they minimize debris and eliminate the fire risk associated with sparks near underlayment.
Trust the Pros with Your Metal Roof
Understanding how professionals cut metal roofing helps you evaluate the quality of any contractor you are considering. If you see a crew using angle grinders on metal panels, that is a red flag.
OKC Roofers uses proper cutting techniques on every metal roofing project and holds Oklahoma License #80005389. We are certified by TAMKO, IKO, Atlas, and Malarkey and back every installation with our 25 year leak guarantee. Financing, insurance, and cash payment options are all available.
Call 405-796-8858 or visit okcroofers.com/metal-roofing/ for a free 18 point drone and attic inspection.